PHP String Functions

function	Description
Addcslashes ()	Returns a string that adds a backslash before the specified character.
Addslashes ()	Returns a string that adds a backslash before a predefined character.
Bin2Hex ()	Converts a string of ASCII characters to a hexadecimal value.
Chop ()	Removes white space characters or other characters to the right of a string.
Chr ()	Returns the character from the specified ASCII value.
Chunk_split ()	Splits a string into a series of smaller parts.
Convert_cyr_string ()	Converts a string from one Cyrillic character set to another.
Convert_uudecode ()	Decodes a uuencode encoded string.
Convert_uuencode ()	Encodes a string using the uuencode algorithm.
Count_chars ()	Returns information about the characters used in the string.
CRC32 ()	Computes a 32-bit CRC of a string.
Crypt ()	One-way string encryption (hashing).
Echo ()	Outputs one or more strings.
Explode ()	Breaks the string into arrays.
fprintf ()	Writes a formatted string to the specified output stream.
Get_html_translation_table ()	Returns the translation tables used by Htmlspecialchars () and Htmlentities ().
Hebrev ()	Converts the Hebrew text to visible text.
HEBREVC ()	Converts the Hebrew text to visible text and converts the new line (\ n) to <br>.
Hex2bin ()	Converts a string of hexadecimal values to ASCII characters.
Html_entity_decode ()	Converts an HTML entity to a character.
Htmlentities ()	Converts a character to an HTML entity.
Htmlspecialchars_decode ()	Converts some of the predefined HTML entities to characters.
Htmlspecialchars ()	Convert some of the predefined characters to HTML entities.
Implode ()	Returns a string that is composed of array elements.
Join ()	The alias of the Implode ().
Lcfirst ()	Converts the first character of a string to lowercase.
Levenshtein ()	Returns the Levenshtein distance between two strings.
Localeconv ()	Returns local numeric and currency format information.
LTrim ()	Removes white space characters or other characters to the left of a string.
MD5 ()	Computes the MD5 hash of the string.
Md5_file ()	Computes the MD5 hash of the file.
Metaphone ()	Computes the Metaphone key for the string.
Money_format ()	Returns a string formatted as a currency string.
Nl_langinfo ()	Returns the specific local information.
NL2BR ()	Inserts an HTML newline character before each new line in the string.
Number_format ()	Format numbers in thousands.
Ord ()	Returns the ASCII value of the first character in a string.
Parse_str ()	Parses the query string into a variable.
Print ()	Outputs one or more strings.
printf ()	Outputs a formatted string.
Quoted_printable_decode ()	Converts the quoted-printable string to a 8-bit string.
Quoted_printable_encode ()	Converts a 8-bit string to a quoted-printable string.
Quotemeta ()	The reference meta character.
RTrim ()	Removes white space characters or other characters to the right of a string.
SetLocale ()	Set up region information (geographic information).
SHA1 ()	Computes the SHA-1 hash of the string.
Sha1_file ()	Computes the SHA-1 hash of the file.
Similar_text ()	Calculates the similarity of a two string.
Soundex ()	Computes the Soundex key for the string.
sprintf ()	Writes a formatted string to a variable.
SSCANF ()	Parses input from a string according to the specified format.
Str_getcsv ()	Parse the CSV string into the array.
Str_ireplace ()	Replaces some of the characters in a string (insensitive to case).
Str_pad ()	Fills the string with a new length.
Str_repeat ()	Repeats the string to a specified number of times.
Str_replace ()	Replaces some characters in a string (case sensitive).
STR_ROT13 ()	Performs ROT13 encoding on the string.
Str_shuffle ()	Randomly disrupts all characters in a string.
Str_split ()	Splits a string into an array.
Str_word_count ()	Calculates the number of words in a string.
STRCASECMP ()	Compares two strings (not case sensitive).
STRCHR ()	Finds the first occurrence of a string in another string. (The alias of the Strstr (). ）
strcmp ()	Compares two strings (case sensitive).
Strcoll ()	Compares two strings (based on local settings).
STRCSPN ()	Returns the number of characters to look up in a string before any part of the specified character is found.
Strip_tags ()	Strip the HTML and PHP tags from the string.
Stripcslashes ()	Removes backslashes added by the addcslashes () function.
Stripslashes ()	Removes backslashes added by the addslashes () function.
Stripos ()	Returns the position of the first occurrence of a string in another string (not case sensitive).
Stristr ()	Finds the position of the first occurrence of a string within another string (case insensitive).
Strlen ()	Returns the length of the string.
STRNATCASECMP ()	Use a "natural sort" algorithm to compare two strings (not case sensitive).
STRNATCMP ()	Use a "natural sort" algorithm to compare two strings (case sensitive).
STRNCASECMP ()	String comparison of the first n characters (not case sensitive).
STRNCMP ()	A string comparison of the first n characters (case sensitive).
STRPBRK ()	Finds any one character of a set of characters in a string.
Strpos ()	Returns the position of the first occurrence of a string in another string (case sensitive).
STRRCHR ()	The lookup string appears last in another string.
Strrev ()	Reverses the string.
Strripos ()	Finds the position of the last occurrence of a string in another string (not case sensitive).
Strrpos ()	Finds the position of the last occurrence of a string in another string (case sensitive).
STRSPN ()	Returns the number of specific characters contained in the string.
Strstr ()	Finds the first occurrence of a string in another string (case sensitive).
Strtok ()	Splits a string into smaller strings.
Strtolower ()	Converts a string to a lowercase letter.
Strtoupper ()	Converts a string to uppercase.
STRTR ()	Converts a specific character in a string.
SUBSTR ()	Returns a portion of a string.
Substr_compare ()	Compares two strings from a specified starting position (binary security and case sensitivity).
Substr_count ()	Calculates the number of occurrences of a substring in a string.
Substr_replace ()	Replaces a part of a string with another string.
Trim ()	Remove whitespace characters and other characters on either side of the string.
Ucfirst ()	Converts the first character in a string to uppercase.
Ucwords ()	Converts the first character of each word in a string to uppercase.
vfprintf ()	Writes a formatted string to the specified output stream.
vprintf ()	Outputs a formatted string.
vsprintf ()	Writes the formatted string to the variable.
WordWrap ()	Break string to a specified number of strings

PHP String Functions